US3715350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel method for the preparation of 2alpha,3alpha-epithio-alpha-steroids
Assignee: Shionogi and Co Ltd
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Filing: 1971-04-09
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Granted: 1973-02-06
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Expires: 1991-04-09
Abstract
Abstract HORMONAL 2A,3A-EPITHIO-5A-STERIODS ARE PREPARED BY A NOVEL METHOD COMPRISING (I) A NEW PROCESS WHICH CONSISTS OF TREATING A 3-HALO- OR ACYLOXY-5A-STEROID WITH A BASIC ACID-ELIMINATING REAGENT TO GIVE A CORRESPONDING &2-5A-STERIOD; (II) ANOTHER NEW PROCESS CONSISTING OF A FIRST STEP IN WHICH A $2-5A-STERIOD IS TREATED WITH A SULFUR HALIDE COMPOUND TO GIVE A 3B- OR 2B-HALO-5A-STERIOD-2AOR 3A-POLYSULFIDE AND A SECOND STEP IN WHICH THE PRODUCT OF THE FIRST STEP IS TREATED WITH REDUCING AND DEHALOGENATING REAGENTS TO OBTAIN THE OBJECT 2A,3A-EPITHIO-5ASTERIODS.
Inventors
- 👤 Y Hamashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:19
CPC Classifications
C; C07; C07J; C07J33/00; C07J31/00; C07J75/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |